US8276685B2 - Electrical power tool - Google Patents

Electrical power tool Download PDF

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Publication number
US8276685B2
US8276685B2 US12/643,446 US64344609A US8276685B2 US 8276685 B2 US8276685 B2 US 8276685B2 US 64344609 A US64344609 A US 64344609A US 8276685 B2 US8276685 B2 US 8276685B2
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US
United States
Prior art keywords
operation switch
chuck
rotation
electrical power
tool
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Active
Application number
US12/643,446
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English (en)
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US20100163265A1 (en
Inventor
Akihiro Hozumi
Koji Omori
Hiroyuki Miyaura
Yoshiyuki Baba
Junichi Nishikimi
Akira Tomonaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Makita Corp
Original Assignee
Omron Corp
Makita Corp
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Filing date
Publication date
Application filed by Omron Corp, Makita Corp filed Critical Omron Corp
Assigned to OMRON CORPORATION, MAKITA CORPORATION reassignment OMRON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIYAURA, HIROYUKI, BABA, YOSHIYUKI, HOZUMI, AKIHIRO, OMORI, KOJI, TOMONAGA, AKIRA, Nishikimi, Junichi
Publication of US20100163265A1 publication Critical patent/US20100163265A1/en
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Publication of US8276685B2 publication Critical patent/US8276685B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose

Definitions

  • the present invention relates to an electrical power tool.
  • a conventional electrical power tool has a tool body coaxially extending with a rotation axis of a tip tool, a grip extending downward from the tool body, and a trigger provided on top of the grip.
  • the tip tool is rotated at a speed according to the degree to which the trigger is pulled in.
  • Patent Document 2 discloses the invention in which a relationship between the degree to which a trigger is pulled in and a rotation speed of a tip tool is varied depending on the rotation direction.
  • the tool body and the grip are bent and fixed, so that the electrical power tool cannot enter a work space if it is small.
  • Patent Document 1 JP2006-218560A
  • Patent Document 2 U.S. Pat. No. 3,768,400
  • the present invention is to provide an electrical power tool that a user can intuitively grasp a rotation speed, preferably a rotation direction, of a tip tool, and more preferably to provide an electrical power tool whose shape can be changed according to the work space.
  • an electrical power tool comprises:
  • a chuck provided at a tip of a tool body, and rotatable with a tip tool held
  • an operation switch exposed to a side surface of the tool body so as to be able to operate, and rotatably provided around an axis parallel to a rotation axis of the chuck, wherein
  • the chuck is rotated at a speed according to a rotation angle of the operation switch.
  • the operation switch since the operation switch is rotated with respect to the tool body, the user can intuitively grasp the rotation angle from a neutral position of the operation switch, from a relative angle between the tool body and the operation switch. Further, since the tip tool is rotated coaxially with the operation switch according to the rotation angle of the operation switch, the user can intuitively grasp a rotation speed of the tip tool, and perform fine speed control.
  • the chuck may be rotated in a direction according to a rotation direction of the operation switch.
  • the operation switch may be urged so as to be self-restored to a neutral position at which rotation of the chuck is stopped.
  • the operation switch may have operation protrusions respectively protruded from both side surfaces of the tool body, and bilaterally symmetrically formed with a rotation axis of the operation switch therebetween, preferably with the rotation axis therebetween at an angle of 180°.
  • the electrical power tool of the present invention may have a lock mechanism capable of preventing rotation of the operation switch at a neutral position by engaging therewith.
  • a grip gripped by a user is provided at a rear end of the tool body, and the operation switch may be provided in the vicinity of the grip.
  • the grip may be rotatably attached so as to be able to both extend roughly parallel to the rotation axis of the operation switch, and extend at a slant or a right angle with respect to the rotation axis of the operation switch, from the rear end of the tool body.
  • the grip by placing the grip at a slant or at a right angle with respect to the rotation axis of the operation switch, it can be used as an electrical power tool of a gun-grip type, and, by placing the grip parallel to the rotation axis of the operation switch, it can be used also as an electrical power tool of a pen-grip type which can be inserted into a work space having a narrow width.
  • the operation switch which is rotated around the axis parallel to the rotation axis of the tip tool, and determines the rotation direction and the rotation speed of the tip tool according to the rotation direction and the rotation angle of the operation switch, is provided, the user can intuitively grasp the operation amount of the operation switch, and finely control the speed of the tip tool.
  • the grip is rotatable with respect to the tool body, whereby the electrical power tool can be used in various work spaces by changing the shape of the electrical power tool.
  • FIG. 1 is a perspective view of an electrical power tool of one embodiment of the present invention
  • FIG. 2 is a left side view of the electrical power tool of FIG. 1 ;
  • FIG. 3 is a right side view of the electrical power tool of FIG. 1 ;
  • FIG. 4 is a left side view in a state in which a grip of the electrical power tool of FIG. 1 is rotated;
  • FIG. 5 is a perspective view of an operation switch of the electrical power tool of FIG. 1 ;
  • FIG. 6 is a cross sectional view of the operation switch of FIG. 5 ;
  • FIG. 7 is a cross sectional view of the operation switch of FIG. 5 when rotated
  • FIG. 8 is a perspective view of the operation switch of FIG. 5 when rotated right-handed;
  • FIG. 9 is a perspective view of the operation switch of FIG. 5 when rotated left-handed;
  • FIG. 10 is an axial cross sectional view of the operation switch of the electrical power tool of FIG. 1 ;
  • FIG. 11 is a graph showing a relationship between a rotation angle of the operation switch and a rotation speed of a chuck in the electrical power tool of FIG. 1 ;
  • FIG. 12 is a graph showing an alternative idea of the relationship between the rotation angle of the operation switch and the rotation speed of the chuck in FIG. 11 .
  • FIGS. 1 to 3 show an electrical power tool 1 of one embodiment of the present invention.
  • the electrical power tool 1 has a chuck 2 which is rotatable with a tip tool such as a drill and a driver gripped, a roughly cylindrical shaped tool body 3 , which is roughly coaxial with a rotation axis of the chuck 2 , and a grip 4 for a user to grip, which extends downward and obliquely backward from a rear end of the tool body 3 .
  • the tool body 3 has an operation switch 7 having two operation protrusions 6 respectively protruded from switch openings provided on both sides in the vicinity of the rear end, and a lock switch 8 provided so as to be positioned above the operation switch 7 .
  • the operation protrusions 6 are protrusions, each of which extends parallel to the rotation axis of the chuck 2 , and which are bilaterally symmetrically formed with the rotation axis of the chuck 2 therebetween at an angle of 180°.
  • the tool body 3 has a motor (not shown) for rotating the chuck 2 built therein.
  • the grip 4 detachably holds a battery 9 , and is rotatably attached with respect to the tool body 3 .
  • the grip 4 can also deform the whole electrical power tool 1 in a roughly rod shape by being aligned in a roughly straight line with the tool body 3 . This enables the electrical power tool 1 to be inserted into a narrow work space, where work can be performed.
  • the operation switch 7 taken out from the tool body 3 is shown in FIG. 5 .
  • the operation switch 7 consists of a roughly cylindrical shaped cylinder 10 formed with the operation protrusions 6 , and a switch body 11 located inside the cylinder 10 and fixed with respect to the tool body 3 .
  • the cylinder 10 is rotatable around the switch body 11 , and is incorporated into the tool body 3 so that a rotation axis of the cylinder 10 is coaxial with the rotation axis of the chuck 2 and the tip tool held by the chuck 2 .
  • the cylinder 10 has a notch 12 formed in one end of a cylinder wall.
  • the operation switch 7 has an action portion 13 , which is integrally rotated with the cylinder 10 inside the switch body 11 .
  • the switch body 11 is formed in a roughly cylindrical shape, and has an engagement portion 14 that inwardly protrudes.
  • the operation switch 7 has an urging spring 15 whose central portion is wound around a rotation shaft of the cylinder 10 , and whose both end portions pinch the action portion 13 and the engagement portion 14 .
  • the action portion 13 and the engagement portion 14 are separated to expand the both end portions of the urging spring 15 against its urging force.
  • the urging spring 15 rotates the action portion 13 by its urging force so that the action portion 13 is radially aligned with the engagement portion 14 , and then allow the cylinder 10 to be self-restored to a neutral position where the operation protrusions 6 become horizontal.
  • the operation switch 7 has an input terminal connected to an electrode of a battery 9 attached to the grip 4 , an output terminal connected to an input terminal of the motor built in the tool body 3 , and a speed controlling circuit built therein, which can invert the polarity of the output terminal and vary the output voltage while controlling a current application time ratio.
  • the speed controlling circuit outputs no voltage to the output terminal when the cylinder 10 is at the neutral position, so as to stop rotation of the chuck 2 .
  • the speed controlling circuit of the operation switch 7 outputs a voltage according to a rotation angle of the cylinder 10 with the polarity that rotates the chuck 2 right-handed.
  • the chuck 2 is rotated at a speed according to the rotation angle of the cylinder 10 of the operation switch 7 .
  • the rotation speed of the chuck 2 when referring to the rotation speed of the chuck 2 (tip tool), it indicates an unloaded rotation speed, and does not necessarily coincide with a rotation speed when loaded.
  • the speed controlling circuit of the operation switch 7 outputs a voltage to rotate the chuck 2 left-handed according to the rotation angle of the cylinder 10 .
  • the user can extend the user's thumb and put it on the operation protrusion 6 provided in the vicinity of the grip 4 , and can also extend the user's index finger and put it on the operation protrusion 6 on the opposite side, and further can hold the operation protrusions 6 in a manner so as to pinch the operation protrusions 6 on both sides with the thumb and the index finger. That is, the user can rotate the cylinder 10 of the operation switch 7 while gripping the grip 4 . Further, this is the same both when the electrical power tool 1 is gripped by the right hand and when it is gripped by the left hand and thus it is possible to handle the electrical power tool 1 by either the right or left hand.
  • the user can intuitively grasp the rotation angle of the operation switch 7 based on a direction of the grip 4 that the user grips. That is, the user can easily grasp the rotation speed of the chuck 2 and finely control its rotation speed.
  • a rotation axis of the operation switch 7 is coaxial with the rotation axis of the chuck 2 in the electrical power tool 1 of the present embodiment, even if the rotation axis of the operation switch 7 is not coaxial with the rotation axis of the chuck 2 , there is almost no problem in operability as long as the rotation axis of the operation switch 7 is roughly parallel to the rotation axis of the chuck 2 .
  • the lock switch 8 is slidably provided parallel to the rotation axis of the chuck 2 and the operation switch 7 , and engageable with a notch 12 formed in the cylinder 10 of the operation switch 7 . That is, as shown in the figure, the lock switch 8 engages with the notch 12 by sliding to the grip 4 side when the operation switch 7 is at the neutral position, so as to construct a lock mechanism to prevent rotation of the cylinder 10 by engaging therewith.
  • Preventing the rotation of the operation switch 7 by the engagement of the lock switch 8 therewith enables the chuck 2 to be kept in a stopped state. This makes it possible to prevent injury, damage to articles, and wasteful power consumption due to unintentional rotation of the tip tool caused by a contact of the electrical power tool 1 with a floor or surrounding objects, so that the operation switch 7 is accidentally operated.
  • FIG. 11 shows a relationship between the rotation angle of the operation switch 7 and the rotation speed of the chuck in the electrical power tool 1 .
  • the operation switch when the operation switch is at the neutral position, an electrical path is opened between the input terminal and the output terminal of the speed controlling circuit so as not to output a voltage.
  • the operation switch 7 When the operation switch 7 is rotated by a few degrees, the input terminal and the output terminal of the speed controlling circuit are connected via a switching element for opening/closing them at a specific time ratio.
  • a variable resistance value of a variable resistor is changed so that the closed time of the switching element becomes longer in proportion to the rotation angle of the operation switch 7 .
  • the switching element when the operation switch 7 is rotated by about 30°, the switching element is continuously turned on so that the chuck 2 is rotated at a maximum speed. By this, the user can almost linearly control the rotation number of the tip tool.
  • the relationship between the rotation angle of the operation switch 7 and the rotation speed of the chuck 2 may acceleratingly change.
  • the chuck 2 (and the tip tool held therein) were rotated in the same direction as the rotation direction of the operation switch 7 , for example, when operating the electrical power tool 1 by extending only the user's thumb to the operation protrusion, in some cases, the right-handed user sensibly feels it easier to use it when the rotation direction of the operation switch 7 and the rotation direction of the chuck 2 are opposite to each other. That is, in the present invention, the rotation direction of the operation switch 7 and the rotation direction of the chuck 2 may be opposite to each other. Alternatively, the relationship between the rotation direction of the operation switch 7 and the rotation direction of the chuck 2 may be reversed.
  • the chuck 2 may be rotated in the forward direction even if the operation switch 7 is rotated in either direction from the neutral position.
  • the present invention can be utilized for an electrical power tool for controlling the rotation direction and the rotation speed of the tip tool such as a drill, a driver bit and a grinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US12/643,446 2008-12-26 2009-12-21 Electrical power tool Active US8276685B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-333662 2008-12-26
JP2008333662A JP4961418B2 (ja) 2008-12-26 2008-12-26 電動工具

Publications (2)

Publication Number Publication Date
US20100163265A1 US20100163265A1 (en) 2010-07-01
US8276685B2 true US8276685B2 (en) 2012-10-02

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Application Number Title Priority Date Filing Date
US12/643,446 Active US8276685B2 (en) 2008-12-26 2009-12-21 Electrical power tool

Country Status (4)

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US (1) US8276685B2 (zh)
EP (1) EP2202035B1 (zh)
JP (1) JP4961418B2 (zh)
CN (1) CN101767329B (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9956676B2 (en) 2013-01-09 2018-05-01 Techtronic Power Tools Technology Limited Tool with rotatable head
DE102018121536B3 (de) * 2018-09-04 2020-02-13 Wiha Werkzeuge Gmbh Schaltvorrichtung, Handwerkzeug und Verwendung einer Schaltvorrichtung
US11504829B2 (en) * 2020-03-19 2022-11-22 Joseph Pannone Powered socket wrench assembly
US11607794B2 (en) 2017-06-12 2023-03-21 Atlas Copco Industrial Technique Ab Power wrench with adjustable trigger position
US11958155B2 (en) 2019-09-12 2024-04-16 Andreas Stihl Ag & Co. Kg Handheld work apparatus having a work tool

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EP2289670B1 (en) * 2009-08-31 2012-07-11 Robert Bosch GmbH Rotary power tool
JP5368946B2 (ja) * 2009-11-16 2013-12-18 株式会社マキタ 電動工具
US9266230B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Twist-handled power tool with locking system
US8555999B2 (en) * 2010-04-30 2013-10-15 Black & Decker Inc. Twist-handled power tool with locking system
DE102012206884A1 (de) * 2012-04-26 2013-10-31 Robert Bosch Gmbh Handwerkzeugmaschine
DE102013000266A1 (de) * 2013-01-10 2014-07-10 Alfred Raith GmbH Sägen- und Werkzeugfabrikation Schalt- und Steuereinrichtung für ein Elektrowerkzeug und Verfahren zu dessen Steuerung
DE102013200576A1 (de) * 2013-01-16 2014-07-17 Robert Bosch Gmbh Handwerkzeugmaschine mit einem ergonomischen Handgriff
JP6481881B2 (ja) * 2014-08-26 2019-03-13 パナソニックＩｐマネジメント株式会社 電動工具
DE102014218122A1 (de) * 2014-09-10 2016-03-10 Robert Bosch Gmbh Batteriebetriebene Handwerkzeugmaschine mit mindestens einem Motorgehäuseteil
DE102015214315A1 (de) * 2015-07-29 2017-02-02 Robert Bosch Gmbh Tragbare Werkzeugmaschine
JP6506669B2 (ja) * 2015-10-06 2019-04-24 アルスコーポレーション株式会社 刈込機
JP6821346B2 (ja) * 2016-07-11 2021-01-27 京セラインダストリアルツールズ株式会社 電動ドライバ
BR112019024986A2 (pt) * 2017-06-12 2020-06-16 Atlas Copco Industrial Technique Ab Chave de força com acionamento angular
US11498198B2 (en) * 2019-08-20 2022-11-15 The Boeing Company Ergonomic handle for a power tool
JP2021181145A (ja) * 2020-05-20 2021-11-25 オムロン株式会社 ネジ締め不良判定装置
US20220023957A1 (en) * 2020-07-22 2022-01-27 Angel Botello Sheet Metal Tooling Assembly

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9956676B2 (en) 2013-01-09 2018-05-01 Techtronic Power Tools Technology Limited Tool with rotatable head
US11607794B2 (en) 2017-06-12 2023-03-21 Atlas Copco Industrial Technique Ab Power wrench with adjustable trigger position
DE102018121536B3 (de) * 2018-09-04 2020-02-13 Wiha Werkzeuge Gmbh Schaltvorrichtung, Handwerkzeug und Verwendung einer Schaltvorrichtung
US11958155B2 (en) 2019-09-12 2024-04-16 Andreas Stihl Ag & Co. Kg Handheld work apparatus having a work tool
US11504829B2 (en) * 2020-03-19 2022-11-22 Joseph Pannone Powered socket wrench assembly

Also Published As

Publication number Publication date
US20100163265A1 (en) 2010-07-01
JP2010155294A (ja) 2010-07-15
EP2202035B1 (en) 2013-07-24
CN101767329B (zh) 2012-07-18
EP2202035A8 (en) 2010-11-17
EP2202035A2 (en) 2010-06-30
EP2202035A3 (en) 2012-08-15
JP4961418B2 (ja) 2012-06-27
CN101767329A (zh) 2010-07-07

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